An anal blowfish occurs by putting your gasey partner on all fours, begin tonguing the anus until your partner farts into your mouth causing a firm puffing of the mouth cheeks - resulting in an anal blowfish.
When one person moons another through a glass window but puts their anus against the glass and farts. Similar to a blowfish but using the anus instead of the mouth.
Kyle was minding his own business in his office then Mike gave him an Anal Blowfish and got fired.
The occasional accident that can occur during a fart, or after anal people penetration from a large cock as big or bigger than my dick, both resulting in a gapping of said ass hole causing fecal matter to just fall out under the power of gravity only all the way up 2 a full fecal explosion, both resulting in an "Anal Blowout"
1 - "Dude, as ass pounded this crazy slut so hard up the shitter, she was having an anal blowout as she ran for the bathroom screaming in pain bro !!! I definitely heard her fart, but I'm pretty sure she shit on the floor before she could make it onto the shitter. That ass hole was gaped wide after that day, but at least she cleaned the shit off the floor, so props for dat boy !!!